Synthesis of Co(Acac)3 - 1077 Words

Amanda Tran Date of lab: 04/25/05 Date submitted: 05/09/05 Chem 2130-3 Experiment 3: Synthesis of Co(acac-NO2)3 Introduction In this lab, Co(acac ·NO2)3 is synthesized using the Co(acac)3 complex produced in Experiment 2. The Co(acac)3 complex is used as a reagent instead of acacH because acacH cannot be directly converted to 3-nitroacetylacetone. Since Co(acac)3 is not stable in HNO3, Cu(NO3)2 and acetic anhydride are used in this reaction to produce the final product, Co(acac ·NO2)3. The exact mechanism of the reaction is unknown, however, it is believed to proceed as follows: 1) [pic] 2) [pic] Data and Calculations Table 1: Measurements of weights and melting point |†¦show more content†¦Ã¢â‚¬ ¢ Theoretical Yield [pic] †¢ Percent Yield [pic] Results 1.3002 g finely ground copper nitrate trihydrate, 20 mL acetic anhydride, and 0.4998 g Co(acac)3 was mixed in a flask, producing a dark green, translucent solution. Transferring this solution to ice water and sodium acetate caused a black-green oil to form in the solution. Addition of ethanol solidified the oil to form a dark green powder/paste. 0.3510 grams of product with a melting point of 182-187 °C was synthesized in this experiment. 1) In order for all the nitrogen in Cu(NO3)2 ·3H2O to be incorporated into Co(acac)3, a stoichiometric ratio of 2/3 moles Co(acac)3 to 1 mole Cu(NO3)2 ·3H2O would be required. The actual mole ratio used in the experiment was 0.26 moles Co(acac)3 to 1 mole Cu(NO3)2 ·3H2O, thus, the amount of product was limited by Co(acac)3. This ratio was used because balancing the equations (see Data Calculations above) showed that 1 mole Cu(NO3)2 ·3H2O produced 2 moles C2H3O2NO2, and that 3 moles C2H3O2NO2 react with 1 mole Co(acac)3. Since there were only 2 moles of C2H3O2NO2 were available, all reactants and products in the second equation were multiplied by 2/3 to obtain 2 moles of C2H3O2NO2. Less than 2/3 moles Co(acac)3 was used in the experiment because not all the nitrogen in Cu(NO3)2 ·3H2O can react and be incorporated into Co(acac)3. 2) Co(acac)3 + 3 C2H3O2NO2 ( Co(acac-NO2)3 + 3 C2H3O2 Since only 2 moles of C2H3O2NO2Show MoreRelatedSynthesis of Co(Acac)31062 Words   |  5 Pagessubmitted: 05/09/05 Chem 2130-3 Experiment 3: Synthesis of Co(acac-NO2)3 Introduction In this lab, Co(acac ·NO2)3 is synthesized using the Co(acac)3 complex produced in Experiment 2. The Co(acac)3 complex is used as a reagent instead of acacH because acacH cannot be directly converted to 3-nitroacetylacetone. Since Co(acac)3 is not stable in HNO3, Cu(NO3)2 and acetic anhydride are used in this reaction to produce the final product, Co(acac ·NO2)3. The exact mechanism of theRead MorePreparation of Bis Acetylacetonao Copper 21382 Words   |  6 Pagesnumber of other molecules or ions surrounding it. These can be considered to be attached to the central ion by co-ordinate (dative covalent) bonds. The molecules or ions surrounding the central metal ion are called ligands. Simple ligands include water, ammonia, acetyl acetone and chloride ions. Ligand has active lone pairs of electrons in the outer energy level. These are used to form co-ordinate bonds with the metal ion. All ligands are lone pair donors. In other words, all ligands function as LewisRead MoreApplication Of Magnetic Polymer Nanocomposites1720 Words   |  7 Pagesdue to their superparamagnetic properties, high biocompatibility, and lack of toxicity to humans. For biomedical applications, some of their uses include both diagnostic and therapeutic in magnetic resonance imaging (MRI) [1, 2], drug delivery agents [3, 4], and as heat mediators in hyperthermia cancer treatment [5, 6]. Unmodified iron oxide magnetic nanoparticles have high surface/volume ratio, which cause magnetic dipole-dipole attractions that result in the formation of aggregates. The aggregation